Development and verification of anion-exchange high-performance liquid chromatography for determination of empty capsid ratio in recombinant adeno-associated virus type 9
Objective To develop and verify an anion-exchange high-performance liquid chromatography(AEX-HPLC)method for the determination of empty capsid ratio of recombinant adeno-associated virus type 9(rAAV9).Methods AEX-HPLC based on the differences in surface charge was used to establish a method for detecting the ratio of empty and full cap-sid rAAV9 by optimizing the elution gradient of mobile phase,pH,column temperature,flow rate,sample concentration,injection volume and detection wavelength of fluorescence detector.The specificity,linearity,limit of detection(LOD),limit of quantitation(LOQ),precision and accuracy of the method were verified to confirm the feasibility.Results Using a CIMac AAV full/empty-0.1 mL column,20 mmol/L BIS-Tris propane(BTP)as mobile phase A and 20 mmol/L BTP+1 mol/L NaCl as mobile phase B,gradient elution was performed with pH of 9.0,column temperature of 20 ℃,flow rate of 1 mL/min,sample concentration of 4 × 1012 vg/mL,injection volume of 10 µL,excitation wavelength of 280 nm and emission wavelength of 330 nm,which realised the baseline isolation and quantitative detection of empty and full capsid rAAV9.The verification results of the method showed that the preparation buffer had no interference with good specificity;rAAV9 showed a good linear relationship in the range of(1.6-8)× 1012vg/mL,r=0.993;the LOD was 5 × 1010vg/mL,and the LOQ was 1 × 1011 vg/mL;the RSD of repeatability and intermediate precision were 2.95％and 2.10％,respectively;the accuracy rates were not less than 80％.Conclusion A highly sensitive and rapid AEX-HPLC method for determination of the ratio of empty capsid to full capsid rAAV9 was developed,which could be used for the analysis of empty capsid rate and quality control in gene therapy products.
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